Respuesta :
Answer:
The correct answer is : 2- Energy.
Explanation:
- Waves are produced due to vibration or movement of molecules about their mean position in response to any disturbance generated on them.
- The disturbance transmits energy into the stationary molecules present in a medium.
- After taking up this energy the stationary molecules begin to vibrate about their mean position, hits the molecules next to it and transmit its energy to them.
- This process continues and eventually the energy gets transmitted through all the stationary molecules present in medium resulting in the generation of a wave.
- However, waves does not always require a medium to travel, but vibration or oscillation is necessary. Based on this two types of waves are:
- Electromagnetic Waves (Light) : Here the electric and magnetic fields oscillates with respect to each other and generates a wave.
- Mechanical Waves (Sound) : It requires a medium to travel and the waves moves by episodes of compressions and rarefactions.
- Based on direction of vibration, waves are of two types:
- Longitudinal waves - Vibration occurs in a direction that is parallel to the direction of motion of the wave.
- Transverse waves - Vibration occurs in a direction that is perpendicular to the direction of motion of the wave.
